Convertible disk harrow



Sept. 9, 1941. o. E. CURTIS CONVERTIBLE DISK HARROW Filed July 19, 19594 Sheets-Sheet 1 INVENTOR AT-rbRNEYs Sept. 9, 1941. o. E. CURTISCONVERTIBLE DISK HARROW Filed July 19, 1959 4 Sheets-Sheet 2 Sept. 9,1941.

O. E. CURTIS CONVERTIBLE DISK HARROW 6 C be 2) L o 0 58 J 4s !6 I 40 a II L INVENTOR 6/16 wmz Sept. 9, 1941. o, gu s 2,255,380

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ttrueg Patented Sept. 9, 1941 CONVERTIBLE DISK HARROW Oscar E. Curtis,Mount Pulaski, Ill.

Application July 19, 1939, Serial No. 285,287

12 Claims.

My invention relates to convertible disk harrows; an object being toimprove, to simplify and to refine the operative design and constructionof such a disk harrow.

A further purpose of my invention is to provide in such an improvedconvertible disk harrow such mechanical details of its construction aswill permit an easy, convenient and operatively practical control of thesame in its'several positions of adjustment under which it may beexpected to be used.

A further purpose of my invention is to provide in such a convertibledisk harrow such mechanical improvements and refinements as will notonly enhance the appearance of such an implement, but such as willaccomplish all of the purposes of mechanical operation found in the diskharrows of my invention which were covered by Patents No. 2,094,144,Sept. 28, 1937, and No. 2,109,769, March 1, 1938, and which will achievesuch purposes in a greatly improved manner.

A particular purpose of this invention is to provide not only a diskharrow which may be operatively adjusted while in motion to a contractedposition when desired, for passing through a farm gate and the like, buta disk harrow which may be adjusted in its operative position to providein the same implement what is recognized in the art as a double-actingdisk harrow and requiring only a negligible time to make suchconvertible adjustments wherein every mechanical change required for thesame is a very simple, convenient and quick manipulation.

I attain the objects of my invention by the implement described in thisspecification, recited in the claims and illustrated in the accompanyingdrawings wherein like-reference numerals refer to like parts in theseveral figures.

Referring to the figures:

Fig. 1 is a top view of my convertible disk harrow showing the same inits widest position of adjustment and shown without extra weightsupporting shelves.

Fig. 2 is a front view of the same shown without the draw bar and itsconnections.

Fig. 3 is a top view of my convertible disk harrow shown in itsoperative extended V formation.

Fig. 4 is a top view of my disk harrow shown in contracted adjustment topermit the same to pass through a farm gate and the like.

Fig. 5 is a side view of my disk harrow shown in a contracted position.

Fig. 6 is a top view of my disk harrow shown in Fig. 5, with the innerdisk gang members interchanged in their operative position.

Fig. 7 is a top view of the disk harrow shown in Fig. 6 but illustratingthe disk gang members when operatively adjusted to a double-actingreverse V position.

Fig. 8 is a rear view of my disk harrow adjustment shOWn in Fig. 1.

Fig. 9 is a birds eye view of the sectional draw bar constructionillustrated in Fig. 8.

Fig. 10 is a bottom view in perspective detail illustrating thesectional draw bar of my disk harrow.

Fig. 11 is a detail of one of the upright supporting brackets connectedby rod or chain to the outer disk gangs and adapted to limit the depthof out which they may make.

Fig. 12 is a detail in perspective illustrating the detachable lockingmeans on the sectional draw bar for holding the respective draw barmembers into selected positions of operative adjustment and adapted tobe controlled by rope pull.

Thus, in a detailed analysis of the construction of my convertible diskharrow implement, it will be observed in the drawings that the sectionaldraw bar consisting of an inner fixed member I has a forward pullingyoke 2 for its detachable connection with a tractor, an intermediateencompassing sleeve member 3, an adjustable collarl encompassing sleeve3 and a rear terminal sleeve 5 which is removably carried as a rearsection of the draw bar.

In conjunction with this type of draw bar construction, I am providing apair of left disk gang sections 6 and l and a pair of right disk gangsections 8 and 9, while these disk gang sections are each adjustablyconnected with the draw bar sections in a manner permitting them to beadjusted at will while the implement-is in motion.

When a longer lever l I is used as a partof the construction of lockingmember Iii, then pulling ropes l2 and I3 may be supported in loop M oflever I l. Collar member 4 has a locking member l5 connected for remotecontrol by rope pull I2 while rear sleeve member 5 has a locking member16 connected for remote control by rope l3.

It will be noted that each of these locking members engages one of theseries of locking holes I! in the draw bar sections by means of aplunger or pin l8 found in each locking member and held in its lockedposition-by aicoiled spring 19 exerting a downward pressure on suchpins.

' It will be noted that integral with the fixed inner section I of thedraw bar, I am providing a yoke 20 having a right eyelet 2| and a lefteyelet 22 for the detachable pivotal engagement of extensible pullingarms 23 and 24 respectively and the sleeve section 3 of the draw bar hasintegral with locking member In a yoke member 25 having eyelets 26 and21 for a detachable engagement of pulling arms 2% and 29.

It will be noted that plunger l8 and locking member ill on sleeve 3detachably engage notches 30 of the fixed front inner section I of thedraw bar to permit the selective slidable adjustment of sleeve 3 on thisfixed section I of the draw bar by the manipulation of upright lever Hwhich controls plunger l8 of locking member I with spring l9 of thislocking member I!) holding plunger !8 in the selected notch amongnotches 3!] until it is optionally released for further adjustment ofsleeve 3.

Thus, it will be observed in the drawings that pulling arms 23 and 24are adjustably and detachably secured to the outer ends of disk gangmembers 6 and 9 respectively, while pulling arms- 28 and 29 arerespectively connected adjacent the inner ends of outer disk gangsections 6 and 9.

It will be noted that looking member 55 is in tegral with collar 4 whichis adapted to be selectively adjusted by slidably moving the same uponsleeve 3 to the position where it is needed and after it is moved to theselected position then plunger l8 of locking member I engages one of theholes IT in sleeve 3 to hold collar 4 in place until it may be againreleased by a pull on rope l2.

Collar 4 has an integral yoke 3| having an eyelet 32 on one side andeyelet 33 on the other for the detachable engagement of pulling arms 34and 35 respectively which are pivot-ally and adjustably secured to theouter ends of the inner disk gang sections 7 and 8 respectively; whilepulling arms 36 and 3'! are respectively engaging eyelets 38 and 39 ofyoke 49 forming a part of rear terminal sleeve 5 and its integrallocking member IS with a remote control rope l3 adapted to control theplunger I8 thereof when it engages and disengages locking holes IT onsleeve 3.

Pulling arms 36 and 31 respectively and adjustably engage the inner diskgang sections 1 and 8 respectively adjacent their inner ends.

This rear terminal sleeve 5 of the sectional draw bar carries atransverse leveling bar 4i operatively connected therewith in a positionpermitting this bar 3! to operatively extend across the rear end ofpulling arms 36 and 37 in order to aid in holding the inner ends of diskgang sections 1 and 8 to a more uniform depth in the soil.

This transverse bar 4! is preferably shaped at its opposite ends todefine hook members 42 and 43 adapted to respectively limit the outwardswing of the inner disk gang members I and 8 wh n they are in operation.

Although there may be no occasion to need any extra weights on myimplement yet there may be situations involving soil conditions wheresome extra weight might be needed, and in order to provide for suchconditions, I am illustrating a pair of weight supporting frame brackets4d and 45 preferably carried by disk gang sections I and 8.

However, it is intended as a feature of merit in my convertible diskharrow implement to provide a construction and design thereof which may,in practically all instances and operating conditions, avoid the need ofextra weights.

It will be noted that the frame 46 of my disk gang sections is supportedby spaced upright bearing members 56 on each disk gang.

It is obvious that in the operation of disk harrows that the toughnessof the soil and a variation in surface conditions of the soil to beworked, there may arise certain field conditions wherein a momentaryadjustment may be made in the operating position of certain disk gangsections to permit all of said sections to Work together moreefficiently for a more uniform depth of cut in the soil.

For this reason, I am providing a pair of upright brackets 49 and 50each removably secured to the inner disk gang sections 1 and 8respectively and it is to the top ends and 52 respectively of thesebrackets 49 and 50 that I establish a control connection with the outerends of the'leveling and spacing bars 4! and 48 respectively throughadjustable rods or chains 53 and 5:1. By this means, I am able toselectively adjust the cutting depth of the outer ends of disk gangsections 5 and 9, thus making it possible to control the uniformity ofcutting depth of all the disk gang sections as the implement is pulledover the soil by a tractor.

When operating my convertible disk harrow on a farm in one field andanother, there are occasions when it becomes necessary to move theimplement through a gate or through some other form of relatively nearpassage. After the tractor has been pulling this implement over thefield in its position of widest operative V adjustment, then it isobvious that it will amount to a substantial saving of time and a greatconvenience to be able to quickly and easily adjust the relativeposition of the respective disk gang sections While the implement isstill in motion so as to materially reduce the width of the implementsufficient to permit the entire implement to pass through such a gate orother like passage between fields on a farm.

This is exactly what I am able to accomplish with my convertible diskharrow.

I achieve this novel and practical purpose by my disk harrow in thefollowing manner:

The operator, when riding the seat of a tractor, with the disk gangsections adjusted to their widest operating V position, finds thesectional draw bar working in a position where locking members Ill, l5,and I6 are slidab-ly assembled in a forward group up adjacent theforward end of the inner fixed section l of the sectional draw bar, andin this position, these locking members are found to be registering attheir respective forward position on the sectional draw bar.

However, when it is desired to reduce the width of the implement,enabling the same to pass through a farm gate then all that is necessaryfor the operator to do is to reach back with one hand while driving thetractor slowly and jerk on remote control ropes l2 and I3, releasinglocking members l5 and I6 from their locked position on sleeve 3 of thesectional draw bar, with the result that the tractor will pull forwardwith the inner section I of the draw bar and with sleeve section thereofas it takes with it pulling arms 23 and 24 and 28 and 29; and thesepulling arms being connected with the outer disk gang sections 6 and 9will thus pull these two sections forwardly and they will each moveinwardly on opposite sides of the sectional draw bar as they go forwardand will come to a tandem position with disk gang sections 6 and 9respectively ahead of disk gang sections 1 and 8.

It is true that when remote control ropes l2 and I3 are jerked by theoperator that this merely releases plungers I8 of the locking members [5and I6 permitting the forward sections l and 3 of the draw bar to moveforward with the tractor and the outer disk gang sections 6 and S andsleeve 3 slides through locking members l5 and 6, with this forwardsliding movement of sleeve 3 stopping when the outer disk gang sections6 and 9 are moved forward out of their V formation with the inner diskgang sections 1 and 8 moved over toward the draw bar until they areabutting end to end under the draw bar, or approximately in this closeposition.

At the same time, this forward movement of the forward sections of thedraw bar when the remote control ropes l2 and it are released, willpermit plunger l8 of locking member I5 to engage one of the rear holesI! of sleeve section 3 of the draw bar so that the forward movement ofsleeve 3 of the draw bar may pull the rear terminal sleeve 5 far enoughforward to contact collar 4 with looking member l5, and this will resultin aligning inner disk gang sections 1 and 8 in a horizontal alignmentparallel with the newly aligned position of outer disk gang members 5and 9 with both pairs of aligned disk gang sections disposed transverseto the direc' tion 'of the draw bar.

In this position, the implement will easily pass through an ordinaryfarm gate. However, after passing through such a farm gate, it may bedesired to again spread the implement to the position of its widest Vadjustment, and when this is desired, then all that is necessary is forthe tractor operator to remain in his seat and place the tractor inreverse for a slow movement while he manipulates the remote controlropes again.

Thus, when the tractor is pushing backward against the forward sectionI' of the sectional draw bar and the operator is releasing lockingmembers l5 and I6, by pulling on remote control ropes l2 and 13, thenthis rear motion of the tractor will cause arms 23, 24, 28 and 29connected with disk gang members 6 and 9 respectively to push theseouter disk gang members 5 and 9 reafrwardly and outwardly until they areagain aligned with the outer ends respectively of inner disk gangsections 1 and 8. Then, when in the final rear adjustment of therelative position of disk gang sections, it is desired to again placeinner sections 1 and 8 into a rear V formation with each other, this isdone by releasing remote control rope i3 to permit plunger l8 of lockmember Hi to engage one of the holes ll of sleeve 3 so that the rearpush of the tractor will force the inner adjacent ends of the inner diskgang sections 1 and 8 rearwardly and they will move somewhat outwardlyas they are pushed back until the hook members 42 and 43 at therespective ends of transverse bar llengage the inner pulling arms 35 and3'! respectively of inner disk gang sections 1 and 8.

Thus, in this position the implement is again ready to disk the soiloperating in its widest V position of disking adjustment.

t will be observed in the drawings that the central spacing and levelingbar 48 connecting disk gang sections 6 and 9 is provided with an uprightyoke 55 adapted to saddle under the rear end of sleeve 3 to aid inholding sleeve 3 in a position of desirable operative alignment behindthe tractor for operative automatic adjustment with respect to the diskgang members. It will be further noted that when outer disk gangsections 6 and 9 are pulled forwardly and inwardly ahead of the innerdisk gang sections 1 and 8 the leveling and spacing arm 4'! swingsaround forward so that it is aligned in a position approximatelyparallel with the draw bar as it establishes a slidable spacing controlconnection between disk gang section 6 and section 1 in their newlyadjusted tandem arrangement.

When operating in this position, it will be noted that leveling andspacing bar 48 in like manner connects disk gang sections 8 and 9 whensection 9 is forwardly and inwardly moved to the new tandem position.Thus, leveling and spacing bars 4? and 48 serve as slidable spacingcontrols between the disk gangs in their new tandem position ofadjustment.

In this tandem adjustment of the disk gang sections of my implement theupright brackets 49 and 5t with their adjustable chains or rods 5! and52 respectively connected-with the outer ends of leveling and spacingbars 41 and 48 respectively are not thus serving any particularessential function and will not do so until the disk gang sections 6 and9 are again outwardly and rearwardly adjusted to the above mentioned Vformation in the widest operating position for the implement.

Thus, when operating my implement in its widest working position ofadjustment, the disk gang sections 5, I, 8 and 9 are arranged in onesingle V formation and in this position of adjustment the disk cutterimplement will cover a greater'area as they go over the field; while theimplement may be made more narrow to permit it to pass through a farmgate by making the details of adjustments that have been hereinabovedescribed, and in making this narrow tandem adjustment the diskbladesare run straight as they move through a gate, thus merely cuttingthe soil surface, while in this position moving through a gate.

However, in addition to the above mentioned w selective adjustments madepossible in the construction of my convertible disk harrow, I have sodesigned and constructed my convertible disk harrow as to permit anovel, practical and convenient operating adjustment to be made thereinwith the essential details of an arrangement of parts thereof for thenew adjustment requiring only a comparatively short period of time.

In fact, with an understanding of the construction and fitting relationof the several parts of lily implement it may require approximatelytwenty to thirty minutes to have them make the change over to anoperating adjustment of the disk gang sections which I shall designateas a double-acting adjustment, wherein one pair of disk gang sectionsmoving in a V formation, runs ahead of the second pair of disk gangsections moving in a reverse V formation with the angular adjustment ofeach, set to a position where the forward pair of disk gang sectionswill throw the soil outwardly as it cuts the surface thereof while therear pair of disk gang sections will throw the soil back leaving theground relatively uniform after it has been disk harrowed in thismanner.

I achieve my purpose in this adjustment of my convertible disk harrowwith its disk gang sections by making changes as follows:

It will be noted in this operative adjustment of my implement that Iwill not need to use rear terminal sleeve section 5 of my draw bar andit will be thus removed from the rear end of sleeve section 3 of thedraw bar. Obviously this removal of rear terminal sleeve takes with itthe locking member it which holds the sleeve 5 in selected positions ofadjustment as it telescopically fits over the rear end of sleeve 3. Alsowith this adjustment, there will be no occasion to use the transverseleveling and spacing bar 4! which is operatively supported beneath thisrear terminal sleeve section 5 of the draw bar.

In this operating position, also for the disk gang sections, there willbe no occasion to use upright brackets 49 and 5t and their connectingchains or rods 5| and 52 and they will be removed along with rearterminal sleeve 5 and transverse leveling and spacing bar 4!.

After the removal of these parts that are not needed, I then makedecided changes in the operating position of the disk gang sections ofmy implement.

In order to change over from a single acting to a double-actingarrangement of my implement I find it more practical to start from thetransport position shown in Figure 4 wherein outer disk gang members areabutting and I first shorten pulling arms 23, 24, 28 and 29. I thenconnect sections 6 and 9 by leveling and spacing bar 48 as is shown inFigure 6.

I next interchange the relative position of inner disk gang sections 7and 8, connecting them together by a leveling and spacing bar 41, andpulling arms 34 and 35 in this new adjustment, are detachably connectedrespectively between the new inner ends of disk gang sections 1 and 8and disk gang sections 6 and S; which intheir new adjustment aredirectly ahead of sections 1 and 8 respectively.

It will be seen that with the disk gang sections 6 and 9 thus adjustedin a V working arrangement, they will each cut the soil surface and drawit outwardly while disk gang sections 1 and 8 arranged in a reverse Voperative formation and operating in an interchanged position that willvery effectively throw the same soil back again in a substantiallyagitated condition.

Thus, in a careful analysis of the construction of my new implement, itwill be found that I am providing a most practical and convenientarrangement of working parts, presenting not only the appearance of amore finished looking farm implement but especially capable of beingselectively adjusted in positions of an operative assembly while theimplement is being moved, preferably by a tractor, in the field; andafter a series of extended practical tests, I have found that in all ofthe desired positions of adjustment, the several parts of my implementfunction perfectly and it has been found by repeated actual field teststo achieve in a most eificient and practical manner every purposedesired in such a farm implement.

Having thus described the nature of my invention, what I claim is:

1. A convertible disk harrow for selective operative adjustments whilein motion and comprising two right and two left disk harrow sec tionsand adjustable means for their interconnection, a sectional draw barslidably adjustable and pivotally connected with said disk harrowsections, said draw bar at its forward end shaped for its detachableengagement with a tractor and the like, pulling arms establishingoperative connection between said sectional draw bar and said diskharrow sections, locking means for the respective sections of said drawbar for their detachable engagement in selected positions of theirlongitudinal adjustment, said locking means on said draw bar sectionsprovided with remote control means for their manipulation by a tractordriver when seated on the tractor, said implement thus adapted to beconverted from a wide type disk harrow to a narrow tandem, arrangementwhile in motion, by a forward pulling movement of said tractor and saidimplement further adapted to be readjusted back to a wide type implementby a rearward move- 'ment of said tractor against said draw bar.

2- A convertible disk harrow for selective operative adjustments whilein motion" and comprising two right and two left disk gang sections,interconnected by telescopically adjustable leveling and spacing bars, asectional draw bar whose sections are telescopically connected foroptional selective adjustment while the implement is in motion, pullingarms establishing operative connection between said disk gang sectionsand said sectional draw bar, locking means for the detachable engagementof said draw bar sections in selected positions of telescopicaladjustment and remote control means and said locking means adapted toextend the control of said locking means up to a point within easyconvenient reach of a tractor driver when pulling said implement,

-said convertible disk harrow thus adapted to be changed from a wideposition of operative adjustment to a narrow tandem position while in aforward motion and further adapted to be readjusted from a narrow tandemposition back to a Wide operating position of adjustment by a rearwardmovement of said tractor against said draw bar.

3. A convertible disk harrow for optional selective adjustment while inmotion and comprising two right and two left disk harrow sections, alongitudinally slidable draw bar made in sections and operativelyconnected with said disk harrow sections by means permitting the pivotaladjustment of said disk harrow sections, means integral with the forwardend of said draw bar for its detachable connection with a tractor,locking means operatively mounted intermediate the ends of saidsectional draw bar, a slidably adjustable leveling and spacing barpivotally and adjustably connecting each of said disk harrow sections,and right and left pulling arms establishing operative pivotalconnection between said disk harrow sections and said draw bar sections;said pulling arms and said leveling and spacing bars providing the meanspermitting said disk harrow to be converted from, a wide type diskharrow implement to a narrow tandem disk harrow implement by a forwardpulling movement of said tractor and also permitting a readjustment ofsaid disk harrow, when desired by a rearward movement of said tractor.

4. A convertible disk harrow comprising in combination, two right andtwo left disk harrow sections pivotally and adjustably connected and atelescopically adjustable and sectional draw bar controllably connectedtherewith; said draw bar provided with means at its forward end for itsattachment to a source of motive power; said adjustable sections of saiddraw bar each provided with detachable locking means for operatively anddetachably securing the sections in selected positions of longitudinaladjustment, 2. fixed pulling yoke at the forward end of said draw barand a right and left pivotally adjustable pulling arm extendingrearwardly from said yoke, one of said draw bar sections shaped todefine a longitudinal sleeve encompassing an interfixed section thereofand provided at its forward end with one of said locking means adaptedto detachably engage a selected stop member out of a plurality thereof,longitudinally aligned adjacent the forward end of the fixed portion ofsaid draw bar; said locking means provided with a fixed yoke pivotallyengaging a right and left longitudinally adjustable pulling arm, asecond locking means rearward of the first and shaped to define a collarencompassing. and slidably supported on. said sleeve section of saiddraw bar, a rope and spring actuated trigger on said collar and saidsleeve provided with a plurality of longitudinally aligned holes for thedetachable selective engagement of said trigger, a pulling yoke definingan integral part of .said collar and a right and left pulling arm eachpivotally adjustable in its connection with said yoke of said collar,said left pulling arms pivotally and respectively engaging said leftdisk gang sections and said right pulling arms pivotally engaging saidright disk gang sections respectively, a plurality of leveling andspacing bars establishing pivotal and operative connection between saiddisk gang sections and bearing members on said sections for theoperative engagement of said right and left pulling arms and saidleveling and spacing bars, and serving as a means of angular adjustmentwith relation to said draw bar and relation to each other, andoperatively serving as a means by which said disk gangs may be movedwhen in use; said leveling and spacing bars adapted to aid in holdingsaid disk gang sections into selected positions of operative adjustmentand also limit the depth of cut for portions of the disk gang sectionsand a pair of upright removable brackets secured to the frame portion ofsaid inner disk gang sections respectively and adjustably connected bytheir top ends respectively with the outer endsof said leveling andspacing bars pivotally connecting with said outer disk gang sections andcontrolling the depth of cut thereof. 7

5. A convertible disk harrow for cultivating the soil-while operativelyconnected with a tractor and comprising in cooperative combination asectional draw bar and a plurality .of disk gangs, with adjacent diskgangs connected by leveling and. spacing bars, said disk gangsadjustably con nected with said sectional draw bar in a mannerpermitting selective operative adjustment of the draw bar sections andthe respective disk gangs while the disk harrow implement is in tractorcontrolled motion, and a plurality of remote controlled detachablelocking means respectively operative on said draw bar sections fordetachably holding said sections into selected positions of operativeadjustment and for optionally and selectively releasing said sectionswhen adjustments are desired with such remote control means easilyaccessible to the tractor driver when the tractor is operativelyconnected with said implement.

'6. A convertible disk harrow for cultivating the soil while operativelyconnected with a tractor and comprising in cooperative combination asectional draw bar and a plurality of disk gangs, with adjacent diskgangs connected by leveling and spacing bars, said disk gangs adjustablyconnected with said sectional draw bar in a manner permitting selectiveoperative adjustment of the draw "bar sections and the respective diskgangs while the disk harrow implement is in tractor controlled motion,and a plurality of remote controlled detachable locking means re-'spectively operative on said draw bar sections for detachably holdingsaid sections into selected positions of operative adjustment, and aplurality of upright brackets removably secured in predeterminedposition on selected disk gang members and having their top endsadjustably and detachably connect-ed respectively with adjacent diskgang members.

7. A convertible disk harrow for cultivating the soil while operativelyconnected with a tractor and comprising in cooperative combination asectional draw bar and a plurality of disk gangs including an inner andan outer right disk gang section and an inner and an outer left diskgang section, leveling and spacing bars adjustably connectingoperatively adjacent sections of said disk gangs and providing means forselectively spacing. said gangs and for operatively holding the same toa relatively uniform depth of soil cut, and adjustable pulling armsconnecting the same with said sectional draw bar, detachable lockingmembers on said draw bar, sections and each connected by remote controlto a position 'within' easy reach of the tractor driver and connectedwith said draw bar and said disk gang sections by means permittingselective slidable adjustment of the draw bar sections and selectiveoperative adjustment of said disk gangs while said implement is intractor controlled motion and a pair of upright brackets removablysecured each respectively on the inner left and inner right disk gangmembers and having their top ends adjustably and detachably connectedrespectively adjacent the outer ends of the outer right and outer leftdisk gang members.

8. A convertible disk harrow comprising'a sectional draw bar, with eachsection thereof provided with means permitting its selective slidableadjustment, a plurality of disk gangs, a plurality of pulling yokes,operatively supported respectively by said sections of said draw bar, aplurality of detachable and adjustable pulling arms establishingconnection between said disk gangs and said draw bar sections and aplurality of bearing attachments on each of said disk gangs fordetachably connecting said pulling. arms thereto, a plurality ofslidably adjustable leveling and spacing bars operatively and detachablyconnecting adjacent pairsof said disk gangs, detachable remotecontrolled means for releasing and selectively adjusting and holdingsaid draw bar sections into selected positions of slidable adjustment,"whereby said disk gangs may be quickly adjusted to a selected operatingposition whether that be a double-acting contracted position or aposition of maximum spread for preparing the soil; and whereby saidconvertible implement may also be readily contracted to permit itspassing through a farm gate.

9. In a convertible disk harrow for selective adjustments while inmotion, the combination with a sectional draw bar whose sections arerelatively slidable in their adjustable fitting relation, of a pair ofinner and a pair of outer disk gangs adjustably and operatively hookedtogether, and a plurality of detachable and adjustable pulling armsrespectively establishing adjustable selective operative connectionbetween one of said disk gangs and one of said draw bar sections,adjustable leveling and spacing bars establishing connection betweenadjacent disk gangs, and upright brackets removably carried by saidinner gangs and each provided with an adjustable support arm connectedwith an ad jacent outer disk gang for the selective leveling adjustmentof said outer disk gang.

10. In a convertible disk harrow, the combinationwith a sectional drawbar whose sections are telescopically slidable in their adjustablefitting relation, of a pair of inner and a pair of outer disk gangsadjustably and operatively hooked together and a plurality of detachableand adjustable pulling arms respectively establishing operativeconnection between the disk gangs and said draw bar sections, means fordetachably securing the forward end of said pulling arms to said drawbar sections and means for detachably connecting said disk gangs withthe other end of said pulling arms; whereby said disk gangs may bereadily adjusted to a selected operative position to define adouble-acting disk harrow wherein the axis of each of said gangs isdisposed at an angle with said draw bar or said disk gangs may beoperatively aligned in a single-acting V formation with said pullingarms operatively adjusted thereto in position to uniformly distributethe application of pulling power to said disk gangs; locking membersonsaid draw bar sections and each connected by remote control means forconvenient manipulation by a tractor driver, for holding the draw barsections into and releasing them from selected positions of slidableadjustment and upright brackets adjustably connecting said inner gangswith said outer gangs for their relative leveling adjustment.

11. In a disk harrow a convertible frame comprising two inner disk gangsand two outer disk gangs, pivotally and adjustably connected, an innerfixed draw bar, the front end of which is shaped to define a pullingyoke to be coupled to a tractor and a pair of hinged extensible armspivotally connected to the outer ends of said outer disk gangs, aslidable sleeve section of said draw bar telescopically housing saidinner draw bar section, a locking means on said sleeve section of saiddraw bar and operatively fixed at the forward end thereof, a pair ofpulling arms establishing pivotal connection between said locking meanson said sleeve draw bar section and the inner ends of said outer gangs,a second remote control locking means slidably encompassing said sleevesection of said draw bar and inner extensible arms establishing pivotalconnection between said second locking means and the outer ends of saidinner disk gangs, a third locking member and a rear terminal sleeve anda pair of inner pulling arms establishing detachable connection betweensaid third locking member and the inner ends of said inner disk gangs, apair of leveling and spacing bars respectively establishing a spacingconnection between said inner and said outer disk gangs, a transversepivoted leveling and spacing bar carried by said draw bar and extendingto the right and left in operative contact with said inner extensiblearms, for their automatic leveling adjustment and said bar hooked downat its ends to limit th outward swing of said arms, an upright bracketon each of said inner disk gangs and adjustment links establishingconnection between the top of said brackets and the Outer portion ofsaid outer disk gangs for the selective leveling adjustment of saidouter disk gangs.

12. In a convertible double-acting disk harrow the combinationcomprising a sectional draw bar, whose sections are relatively slidablein their adjustable fitting relation and a plurality of disk gangsoperatively and adjustably hooked together, a plurality of detachableand extensible arms respectively establishing adjustable operativeconnection between said disk gangs and said draw bar sections; said diskgangs arranged in a manner defining a pair of interchanged inner diskgang members transverse to the draw bar, also defining a pair of outerdisk gangs contracted to an abutting position and transverse to the drawbar; said interchanged inner disk gang members behind said outer diskgangs, and said outer disk gangs respectively connected operatively by aleveling and spacing bar, said outer disk gangs connected to the forwardend of said draw bar by extensible arms and said interchanged inner diskgangs pivotally connected with said draw bar, and said extensible armsdetachably connected with said outer disk gang sections, said sectionshaving remote controlled locking means for their selective adjustmentfrom a tractor when pulling said disk harrow; whereby when thusconnected, said disk gang members may be made to assume an operatingposition with the interchanged inner disk gangs set to define a rear. Vand with said outer disk gangs defining a forward V.

OSCAR E. CURTIS.

